[英]How To Listen To All <input> Events and Then Execute A Command
我正在使用幾個輸入字段創建登錄/注冊表單。 我想知道每當有人單擊或在任何輸入字段中輸入值時如何觸發命令。
<form action="/" method="post">
<div class="top-row">
<div class="field-wrap">
<label for="name">
First Name
<span class="req">*</span>
</label>
<input type="text" name="name" required autocomplete="off" />
</div>
<div class="field-wrap">
<label for="lastname">
Last Name
<span class="req">*</span>
</label>
<input type="text" name="lastname" required autocomplete="off"/>
</div>
</div>
<div class="field-wrap">
<label for="email">
Email Address
<span class="req">*</span>
</label>
<input type="email" name="email" required autocomplete="off" />
</div>
<div class="field-wrap">
<label for="password">
Password
<span class="req">*</span>
</label>
<input type="password" name="password" required autocomplete="off" />
</div>
<button type="submit" class="button button-block">Get Started</button>
</form>
我希望每當有人嘗試在輸入字段中輸入內容時,都可以使用標簽創建一些自定義樣式。
這是我想在有人將某些值放入標簽時添加到標簽的CSS:
label.active {
transform: translateY(50px);
left: 2px;
font-size: 14px;
}
label.highlight {
color: #fff;
}
這是我無法使用的Javascript代碼:
const inputs = document.querySelectorAll('input');
inputs.addEventListener('keyup focus blur', ()=> {
if(inputs.length > 0) {
inputs.previousElementSibling.classList.add('active highlight')
} else {
inputs.previousElementSibling.classList.remove('active highlight')
}
})
你是這個意思?
如果字段不為空,則更改標簽類
function listen(e) { var tgt = e.target; if (tgt.tagName === "INPUT") { tgt.previousElementSibling.classList.toggle('active', tgt.value.trim() !== ""); } } document.getElementById("myForm").addEventListener("input", listen) document.getElementById("myForm").addEventListener("focus", listen) document.getElementById("myForm").addEventListener("blur", listen)
label.active { transform: translateY(50px); left: 2px; font-size: 14px; color:green; }
<form action="/" method="post" id="myForm"> <div class="top-row"> <div class="field-wrap"> <label for="name">First Name <span class="req">*</span></label> <input type="text" name="name" required autocomplete="off" /> </div> <div class="field-wrap"> <label for="lastname">Last Name <span class="req">*</span></label> <input type="text" name="lastname" required autocomplete="off" /> </div> </div> <div class="field-wrap"> <label for="email">Email Address <span class="req">*</span></label> <input type="email" name="email" required autocomplete="off" /> </div> <div class="field-wrap"> <label for="password">Password <span class="req">*</span></label> <input type="password" name="password" required autocomplete="off" /> </div> <button type="submit" class="button button-block">Get Started</button> </form>
您可以遍歷元素並將事件偵聽器附加到每個輸入,也可以在容器上使用事件委托,如下所示:
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